title: The effect of Nd on the properties of ceria-zirconia solid solution and the catalytic performance of its supported Pd-only three-way catalyst for gasoline engine exhaust reduction.
abstract: A series of ceria-zirconia-neodymia mixed oxides with different contents of neodymia and the supported Pd-only three-way catalysts before and after aging have been prepared and characterized. The influence of Nd doping on the structural/textural properties of ceria-zirconia (CZ) and the effect on the three-way catalytic performance are also investigated. The results demonstrate that the addition of neodymia results in the formation of ceria-zirconia-neodymia ternary solid solution (CZN) with better textural and structural properties as well as improved reducibility and redox behavior, leading to the promoted three-way catalytic activity and enlarged air/fuel operation window. The modified solid solution with 5 wt.% neodymia shows the preferable textural/structural properties considering that the capacity of foreign cation is limited in the crystal lattice of ceria-zirconia solid solution, and Pd/CZN5 shows the optimum three-way catalytic performance and wider air/fuel operation window, especially for the corresponding aged one.
authors.affiliation: Institute of Catalysis, Zhejiang University, 148 # Tianmushan Road, Hangzhou 310028, PR China.
authors.forename: Qiuyan
authors.initials: Q
authors.lastname: Wang
authors.forename: Guangfeng
authors.initials: G
authors.lastname: Li
authors.forename: Bo
authors.initials: B
authors.lastname: Zhao
authors.forename: Renxian
authors.initials: R
authors.lastname: Zhou
mesh_terms: D000388:Air; D002384:Catalysis; D002563:Cerium; D005742:Gasoline; D009354:Neodymium; D010084:Oxidation-Reduction; D001335:Vehicle Emissions / Q000517:prevention & control*; D015040:Zirconium
chemical_list: D005742:Gasoline; D001335:Vehicle Emissions; D009354:Neodymium; D002563:Cerium; D015040:Zirconium; C028541:zirconium oxide